1.lamp bead structure
One of the most important Emitting structures of the LED is a bead the size of a mung bean. Although it is small in size, it has something inside it.
When you zoom in on the LED bead structure, you find a chip the size of a sesame seed.
The chip is extremely complex and consists of several layers: the top layer is called the p-type semiconductor layer, the middle layer is called the luminescent layer, and the bottom layer is called the n-type semiconductor layer.
So, how does LED light come from?
2. principle of luminescence
Think of it from a physics point of view: when a current passes through a crystal, electrons in an n-type semiconductor collide violently with holes in a p-type semiconductor at the luminescent layer, producing photons that emit energy (the light you see) in the form of photons.
Leds, also known as light-emitting diodes, are tiny and fragile, making them hard to use directly. The designers added a protective shell and sealed it in, creating an easy-to-use LED bead.
Many LED beads can be put together to form a variety of LED lights.
Semiconductors of different materials produce different colors of light, such as red, green, blue, and so on. So far, however, no semiconductor material has been able to emit white light.
But how do we use the white LED lamp beads?
3. White LED lamp production
There is a need to mention a Nobel Prize - Dr. Shuji nakamura. He invented blue LED, which also laid a certain foundation for white LED. For this important contribution, he was awarded the Nobel Prize in physics in 2014.